Question

Thực hiện các phép tính:

\(a)4{{\rm{x}}^4}{y^6} + 2{{\rm{x}}^4}{y^6}\)

\(b)3{{\rm{x}}^3}{y^5} - 5{{\rm{x}}^3}{y^5}\)

Answer 1

\(a)4{{\rm{x}}^4}{y^6} + 2{{\rm{x}}^4}{y^6} = \left( {4 + 2} \right){x^4}{y^6} = 6{{\rm{x}}^4}{y^6}\)

\(b)3{{\rm{x}}^3}{y^5} - 5{{\rm{x}}^3}{y^5} = \left( {3 - 5} \right){x^3}{y^5} =  - 2{{\rm{x}}^3}{y^5}\)